chiark - git - mdw - catacomb/blob - ghash-def.h

   1 /* -*-c-*-
   2  *
   3  * $Id: ghash-def.h,v 1.7 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * Definitions for generic hash interface
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 #ifndef CATACOMB_GHASH_DEF_H
  31 #define CATACOMB_GHASH_DEF_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <mLib/bits.h>
  40 #include <mLib/sub.h>
  41
  42 #ifndef CATACOMB_ARENA_H
  43 #  include "arena.h"
  44 #endif
  45
  46 #ifndef CATACOMB_GHASH_H
  47 #  include "ghash.h"
  48 #endif
  49
  50 #ifndef CATACOMB_PARANOIA_H
  51 #  include "paranoia.h"
  52 #endif
  53
  54 /*----- Generic hash function interface -----------------------------------*/
  55
  56 /* --- @GHASH_DEF@ --- *
  57  *
  58  * Arguments:   @PRE, pre@ = prefixes for hash function
  59  *
  60  * Use:         Defines the generic hash instance.
  61  */
  62
  63 #define GHASH_DEF(PRE, pre)                                             \
  64                                                                         \
  65 static const ghash_ops gops;                                            \
  66                                                                         \
  67 typedef struct gctx {                                                   \
  68   ghash h;                                                              \
  69   pre##_ctx c;                                                          \
  70   octet buf[PRE##_HASHSZ];                                              \
  71 } gctx;                                                                 \
  72                                                                         \
  73 static ghash *ghinit(void)                                              \
  74 {                                                                       \
  75   gctx *g = S_CREATE(gctx);                                             \
  76   g->h.ops = &gops;                                                     \
  77   pre##_init(&g->c);                                                    \
  78   return (&g->h);                                                       \
  79 }                                                                       \
  80                                                                         \
  81 static void ghhash(ghash *h, const void *p, size_t sz)                  \
  82 {                                                                       \
  83   gctx *g = (gctx *)h;                                                  \
  84   pre##_hash(&g->c, p, sz);                                             \
  85 }                                                                       \
  86                                                                         \
  87 static octet *ghdone(ghash *h, void *buf)                               \
  88 {                                                                       \
  89   gctx *g = (gctx *)h;                                                  \
  90   if (!buf)                                                             \
  91     buf = g->buf;                                                       \
  92   pre##_done(&g->c, buf);                                               \
  93   return (buf);                                                         \
  94 }                                                                       \
  95                                                                         \
  96 static void ghdestroy(ghash *h)                                         \
  97 {                                                                       \
  98   gctx *g = (gctx *)h;                                                  \
  99   BURN(*g);                                                             \
 100   S_DESTROY(g);                                                         \
 101 }                                                                       \
 102                                                                         \
 103 static ghash *ghcopy(ghash *h)                                          \
 104 {                                                                       \
 105   gctx *g = (gctx *)h;                                                  \
 106   gctx *gg = S_CREATE(gctx);                                            \
 107   memcpy(gg, g, sizeof(gctx));                                          \
 108   return (&gg->h);                                                      \
 109 }                                                                       \
 110                                                                         \
 111 static const ghash_ops gops =                                           \
 112   { &pre, ghhash, ghdone, ghdestroy, ghcopy };                          \
 113 const gchash pre = { #pre, PRE##_HASHSZ, ghinit, PRE##_BUFSZ };
 114
 115 /*----- That's all, folks -------------------------------------------------*/
 116
 117 #ifdef __cplusplus
 118   }
 119 #endif
 120
 121 #endif